The electrocardiogram measures the electrical activity of the heart. Clinically, 12-lead electrocardiograms are used. But information, although basic, can guide a layman.
To interpret it, the P wave, the Q wave, and the QRS complex are measured. And the ST segment and the T wave. The Q T. interval
It is a compact equipment that measures ECG, SPO2, and systolic blood pressure in 30 seconds.